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Preparation of superhydrophobic composite membrane for membrane distillation desalination

Authors： YAN An，GUO Hanyu，SHI Le，WANG Changmeng， WU Chunrui，LU Xiaolong

Units： State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China

KeyWords： polyvinylidene fluoride; hollow fiber membrane; superhydrophobic membrane; direct contact membrane distillation

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(4):8-14

Abstract：

In this paper, hydrophilic SiO2 nanoparticles and low surface energy PDMS coating were successively introduced on the surface of the PVDF hollow fiber membrane through the sol-gel method and the surface coating method to construct a super-hydrophobic composite membrane with high roughness and low surface energy, and explored the effects of SiO2 particle size, SiO2 solution coating time, PDMS coating time and other conditions on the performance of composite membranes. The contact angle of SiO2/PVDF composite membrane reached 25.8°, the contact angle of PDMS/SiO2/PVDF composite membrane reached 162.3°, and the membrane distillation flux was 24.5 kg/(m2•h). The performance was stable in the 60 h of 3.5wt% sodium chloride solution membrane distillation test, and the rejection rate was kept above 99.8%.

Funds：

国家基金项目（51978466），国家基金重点项目（51638011）

AuthorIntro：

阎安（1995-），男，天津宁河人，硕士研究生，从事膜材料表面改性及应用研究，Email：13072092170@163.com

Reference：

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